Macbook Pro Core i7 15" Issues

Has anyone else turned on their i7 Macbook Pro and received an error during boot with a folder with a slash through it? When I booted off of my Mac OSX install disk, it looks like the disk Macintosh HD has only 15 GB in it, which is a problem. I didn't make a backup of my stuff yet, and I need to know how to boot normally and retrieve my data, PLEASE!

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